FISHERY BULLETIN: VOL. 80, NO. 1 



100L 



80 



UJ 



_l 



y 60 



_i 

 < 



40 



UJ 



S 20 



or 



UJ 

 Q. 



"- 66 |}62 



H 



o-|976 

 — 1977 



57 



69 



66 63 ,. 68 



68 



51 



65 



68 



I I 

 I 1 



_75 

 63 



62 



ii 



•65 



63 



Figure 2. — Transferrin gene fre- 

 quencies of hatchery coho salmon. 

 Samples are arranged from north to 

 south. Vertical lines represent 95% 

 confidence intervals; numbers above 

 the line show sample sizes. Location 

 codes are as in Figure 1. 



* ~ w> 



WASH 



COLUMBIA 



OREGON 



CALIF 



Table 5.— Environmental data for the stream systems sampled in this study. 



'Provided by district biologists. 



2 Pacific Northwest River Basins Commission 1966. 1967. 1968, 1969, 1972 River Mile Indices Hydrol 

 Hydraul Comm. 



Personal estimate of area utilized by coho in the Columbia drainage 



"Gaumer. T . D Demory, and L Osis 1973 Estuary resources use study Fish Comm Oreg , Div Manage Res 



5 Water Resources Board of Oregon 1969 Oregon long range requirements for water Salem, Oreg . 397 p 



Svilsey and Ham Incorp 1974 Estuarme resources of the Oregon coast A natural resource inventory report 

 to the Oregon Coastal Conservation and Development Commission, Portland. Oreg . 233 p 



'Source of Umpqua Hatchery stock 



"United States Geological Survey 1977 Water resources data for California water year 1977 Water Data 

 Rep CA 77-2. 



Therefore, diseases, life history characteristics, 

 and other factors may play a role in maintaining 

 the patterns of transferrin gene frequencies. 

 Transferrin gene frequencies were in good 



agreement between the two year classes of Ore- 

 gon coast wild stocks, despite the small size of 

 some of the samples (Fig. 3). The heterogeneity 

 between year classes was greater for the Oregon 



112 



